     form))
 
 (defmethod validate "formula" [[_formula_ & args :as form]]
-  (let [[_docstring? opt-map bindings _body] (deconstruct-formula-args args)
+  (let [[docstring? opt-map bindings body] (deconstruct-formula-args args)
         invalid-keys (remove (partial = :num-trials) (keys opt-map))]
     (cond (not (leaves-contain-arrow? (check-part-of args)))
           (simple-report-validation-error form "There is no expection in your formula form:")

          (simple-report-validation-error form (str ":num-trials must be an integer 1 or greater. You tried to set it to: " (:num-trials opt-map)))
      
          :else 
          args)))
  how many facts are generated per formula."
  {:arglists '([docstring? opts-map? bindings & body])}
  [& args]
  (valid-let [[docstring? opts bindings body] (validate &form)
              fact (formula-fact docstring? body)
              conclusion-signal `(midje.sweet/fact
                                   :always-pass midje.sweet/=> :always-pass 
                                   :formula :formula-conclude )]

    `(try
       (loop [cnt-down# (or (:num-trials ~opts) midje.ideas.formulas/*num-trials*)]
         (when (pos? cnt-down#)
           (let [snd-bindings# ~(vec (take-nth 2 (rest bindings)))
                 ~(vec (take-nth 2 bindings)) snd-bindings#]
             (if ~fact
               (recur (dec cnt-down#))
               (shrink-failure-case ~docstring? 
                                    ~(vec (take-nth 2 bindings)) 
                                    snd-bindings# 
                                    ~body)))))
       (finally
         ~conclusion-signal))))

(def future-formula-variant-names (map #(str % "formula") future-prefixes))

